
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkColorPriv.h"
#include "SkGradientShader.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkUtils.h"

static void draw_rect(SkCanvas* canvas, const SkRect& r, const SkPaint& p)
    {
    canvas->drawRect(r, p);

    SkPaint frame(p);
    frame.setShader(NULL);
    frame.setStyle(SkPaint::kStroke_Style);
    canvas->drawRect(r, frame);
    }

static void draw_gradient(SkCanvas* canvas)
    {
    SkRect r = { 0, 0, SkIntToScalar(256), SkIntToScalar(32) };
    SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fTop } };
    SkColor colors[] = { 0xFF000000, 0xFFFF0000 };
    SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, 2,
                  SkShader::kClamp_TileMode);

    SkPaint p;
    p.setShader(s)->unref();
    draw_rect(canvas, r, p);

    canvas->translate(0, SkIntToScalar(40));
    p.setDither(true);
    draw_rect(canvas, r, p);
    }

static void test_pathregion()
    {
    SkPath path;
    SkRegion region;
    path.moveTo(25071800.f, -141823808.f);
    path.lineTo(25075500.f, -141824000.f);
    path.lineTo(25075400.f, -141827712.f);
    path.lineTo(25071810.f, -141827600.f);
    path.close();

    SkIRect bounds;
    path.getBounds().round(&bounds);
    SkRegion clip(bounds);
    bool result = region.setPath(path, clip); // <-- !! DOWN !!
    SkDebugf("----- result %d\n", result);
    }

static SkBitmap make_bitmap()
    {
    SkBitmap bm;
    SkColorTable* ctable = new SkColorTable(256);

    SkPMColor* c = ctable->lockColors();
    for (int i = 0; i < 256; i++)
        {
        c[i] = SkPackARGB32(0xFF, i, 0, 0);
        }
    ctable->unlockColors(true);
    bm.setConfig(SkBitmap::kIndex8_Config, 256, 32);
    bm.allocPixels(ctable);
    ctable->unref();

    bm.lockPixels();
    for (int y = 0; y < bm.height(); y++)
        {
        uint8_t* p = bm.getAddr8(0, y);
        for (int x = 0; x < 256; x++)
            {
            p[x] = x;
            }
        }
    bm.unlockPixels();
    return bm;
    }

class DitherBitmapView : public SampleView
    {
        SkBitmap    fBM8;
        SkBitmap    fBM32;
    public:
        DitherBitmapView()
            {
            test_pathregion();
            fBM8 = make_bitmap();
            fBM8.copyTo(&fBM32, SkBitmap::kARGB_8888_Config);

            this->setBGColor(0xFFDDDDDD);
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "DitherBitmap");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        static void setBitmapOpaque(SkBitmap* bm, bool isOpaque)
            {
            SkAutoLockPixels alp(*bm);  // needed for ctable
            bm->setIsOpaque(isOpaque);
            SkColorTable* ctable = bm->getColorTable();
            if (ctable)
                {
                ctable->setIsOpaque(isOpaque);
                }
            }

        static void draw2(SkCanvas* canvas, const SkBitmap& bm)
            {
            SkPaint paint;
            SkBitmap bitmap(bm);

            setBitmapOpaque(&bitmap, false);
            paint.setDither(false);
            canvas->drawBitmap(bitmap, 0, 0, &paint);
            paint.setDither(true);
            canvas->drawBitmap(bitmap, 0, SkIntToScalar(bm.height() + 10), &paint);

            setBitmapOpaque(&bitmap, true);
            SkScalar x = SkIntToScalar(bm.width() + 10);
            paint.setDither(false);
            canvas->drawBitmap(bitmap, x, 0, &paint);
            paint.setDither(true);
            canvas->drawBitmap(bitmap, x, SkIntToScalar(bm.height() + 10), &paint);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            canvas->translate(SkIntToScalar(20), SkIntToScalar(20));

            draw2(canvas, fBM8);
            canvas->translate(0, SkIntToScalar(fBM8.height() *3));
            draw2(canvas, fBM32);

            canvas->translate(0, SkIntToScalar(fBM8.height() *3));
            draw_gradient(canvas);
            }

    private:
        typedef SampleView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new DitherBitmapView;
    }
static SkViewRegister reg(MyFactory);

